﻿using System;
using System.Security.Cryptography;  
using System.Text;
namespace IPR_StudyMeetingMrgSys.Common.DEncrypt
{
	/// <summary>
	/// DES加密/解密类。
    /// Copyright (C) IPR_StudyMeetingMrgSys
	/// </summary>
	public class DESEncrypt
	{
		public DESEncrypt()
		{			
		}
        #region ========加密======== 

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Encrypt(string Text)
        {
            return Encrypt(Text, "zziprcjh");
        }
        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Encrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            return ret.ToString();
        }

        #endregion

        #region ========解密======== 


        //      /// <summary>
        //      /// 解密
        //      /// </summary>
        //      /// <param name="Text"></param>
        //      /// <returns></returns>
        //public static string Decrypt(string Text) 
        //{
        //          return Decrypt(Text, "litianping");
        //}
        ///// <summary> 
        ///// 解密数据 
        ///// </summary> 
        ///// <param name="Text"></param> 
        ///// <param name="sKey"></param> 
        ///// <returns></returns> 
        //public static string Decrypt(string Text,string sKey) 
        //{ 
        //	DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
        //	int len; 
        //	len=Text.Length/2; 
        //	byte[] inputByteArray = new byte[len]; 
        //	int x,i; 
        //	for(x=0;x<len;x++) 
        //	{ 
        //		i = Convert.ToInt32(Text.Substring(x * 2, 2), 16); 
        //		inputByteArray[x]=(byte)i; 
        //	} 
        //	des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); 
        //	des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8)); 
        //	System.IO.MemoryStream ms=new System.IO.MemoryStream(); 
        //	CryptoStream cs=new CryptoStream(ms,des.CreateDecryptor(),CryptoStreamMode.Write); 
        //	cs.Write(inputByteArray,0,inputByteArray.Length); 
        //	cs.FlushFinalBlock(); 
        //	return Encoding.Default.GetString(ms.ToArray()); 
        //}


        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Decrypt(string Text)
        {
            return Decrypt(Text, "zziprcjh");
        }
        /// <summary> 
        /// 解密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }



        #endregion


    }
}
